"We used to be all homeless." explains the wolf as you both sit on a zoo bench. You've calmed down, but are still having troubles accepting this. "Then some guy offered to give us a home and make us loved if we agreed to be turned into animals. As you've seen, we're not prisoners in our cages, and every night we become anthromrphic and regain the power of speech. The locked zoo becomes our own little community."
"Do the zoo staff know about this?" you ask.
"Oh no. They all leave at closing time and lock us in. In fact, you're the only human we've been able to socialise with. Will you stay with us for a while?"
"Well I haven't much choice." you say with a resigned shrug "I'm locked in too."